APPARATUS FOR TRANSFERRING SIGNALS INDICATIVE OF THE CONDITION WITHIN A ROTARY KILN TO A LOCATION OFF KILN

摘要

A system for monitoring the internal conditions in a rotary kiln is disclosed wherein a series of sensors, such as thermocouples, are installed in ports at various longitudinal and angular coordinates along the total length of the kiln for providing temperature signal samples in the form of sequenced millivolt signals, and a single thermocouple is provided which is insertable in a second series of ports along the kiln to permit immediate localized temperature sensing. The sequenced millivolt signals and the single thermocouple millivolt signals are both fed to respective millivolt-to-milliamp converters mounted on a heat shield on the kiln surface, which shield also mounts two sets of continuous slip rings encircling the kiln. The respective milliamp signals are communicated from the converters to the respective slip ring sets from which they are picked off by suitable stationary contact means disposed adjacent the kiln and conducted to appropriate recorders in a control room. The signals from the series of thermocouples are sequenced by respective routing to a series of junction boxes disposed circumferentially about the kiln shell and successive routing from each junction box under the control of a proximity switch system actuated by means of kiln rotation.